public static string Operation_TypeOf(JsObject scope, string identifier)
{
object value = scope.GetPropertyRaw(scope.Global.ResolveIdentifier(identifier));
if (value == null)
return JsNames.TypeUndefined;
var accessor = value as PropertyAccessor;
if (accessor != null)
return Operation_TypeOf(accessor.GetValue(scope));
return Operation_TypeOf(value);
}